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Is it the Math or is it my Methods?

Hi all. Ron here. It's been a few weeks. I hope everyone is well.

What I have here is part of a program I'm working on. What I'm doing at this point is converting a Fahrenheit temperature to Celsius. Simple enough, but every time I run this thing, it keeps returning -0.0, no matter what. I can't figure out if it's the way I've keyed the formula or if I've done something wrong with the methods. Anyone care to chime in?